CN204510291U - Reduce pressure under a kind of ultra-deep underground space structure base plate drainage system - Google Patents

Abstract

The utility model discloses a decompression drainage system under the bottom plate of an ultra-deep underground space structure. The pipe is composed of several steel pipes with small holes to form a mesh drainage pipe network; the water collection wells are arranged at the joints of the vertical and horizontal intersecting drainage pipes; The drainage pipes in the inverted filter layer converge to the collection wells, and the groundwater is pumped out by the pumping wells. Compared with the prior art, the utility model has lower requirements on the anti-cracking of the bottom plate, good decompression and anti-floating effects, and can effectively control the surrounding surface settlement while the bottom plate meets the anti-floating requirements, greatly reducing the cost of anti-floating piles. The device has simple structure, convenient construction and low engineering cost, and is especially suitable for the anti-floating design of the underground space structure at a depth of 30m.

Description

A decompression and drainage system under the floor of an ultra-deep underground space structure

technical field

The utility model relates to the field of underground structure anti-floating technology, in particular to a decompression and drainage system under the bottom plate of an ultra-deep underground space structure.

Background technique

With the acceleration of urbanization, the development of underground space has been paid more and more attention. For underground buildings such as large-scale underground shopping malls and underground parking garages, the buoyancy of the basement floor due to the penetration of groundwater and surface water has become an engineering project. focus in design.

At present, the anti-floating measures in underground engineering are mainly to install anti-floating anchors and anti-floating piles under the floor, and to balance the buoyancy of groundwater by increasing the overlying weight of the underground structure or setting anti-floating anchors and anti-lift piles. The strength is reasonable, and the later maintenance is simple and convenient, but the engineering cost is relatively large, and the requirements for crack resistance and fatigue resistance of the structure are relatively high.

Utility model content

The purpose of this utility model is to design a decompression and drainage system under the floor of an ultra-deep underground space structure in view of the deficiencies of the prior art. The underground water collected in the sand and gravel filter layer is collected into the water collection well and pumped out, which can limit the buoyancy force of the underground seepage water on the bottom plate, and the decompression effect is obvious. While meeting the anti-floating requirements of the structural bottom plate, the surrounding The surface settlement of the environment can also be controlled within the allowable range. The structure is simple, the crack resistance requirements for the bottom plate are low, the construction period is short, the economy is high, and the anti-floating effect is good. It is especially suitable for the anti-floating design of the 30m deep underground space structure.

The technical solution to realize the purpose of this utility model is: a kind of decompression drainage system under the bottom plate of ultra-deep underground space structure, which is characterized in that the decompression drainage system is composed of gravel filter layer, drainage pipe, It consists of a water collection well and a pumping well, and the drainage pipes are several steel pipes evenly covered with water inlet holes arranged in the gravel filter layer, and several drainage pipes are connected vertically and horizontally to form a grid-like drainage pipe network; The water collection wells are arranged at the junction of the drainage pipes intersecting vertically and horizontally outside the drainage pipe network; the pumping wells are arranged on one side of the drainage pipe network and correspond to the water collection wells one by one. The drainage pipes in the inverted filter layer converge to the water collecting well, and the drainage pipe network is pumped out from the pumping well.

A one-way valve is arranged on the cover plate of the water collection well.

An impermeable geotextile is laid on the gravel filter layer, and a permeable geotextile is laid under the gravel filter layer.

The drainage pipe is wrapped with geotechnical filter cloth.

Compared with the prior art, the utility model has lower requirements on anti-cracking of the bottom plate, good decompression and anti-floating effects, convenient construction, short construction period, high work efficiency and low engineering cost. While meeting the anti-floating requirements of the structural bottom plate, The surface settlement of the surrounding environment can also be controlled within the allowable range, greatly reducing the setting of anti-floating piles, especially suitable for the anti-floating design of the 30m deep underground space structure.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a schematic diagram of the structure of the water collection well;

Fig. 4 is a schematic diagram of the drainage pipe structure;

Fig. 5 is a B-B sectional view of Fig. 4 .

Detailed ways

Referring to accompanying drawing 1～accompanying drawing 2, the utility model is made up of gravel inverted filter layer 1, drainpipe 2, water collection well 3 and pumping well 9 that are arranged under structural bottom plate 11, and described drainpipe 2 is arranged on gravel A plurality of steel pipes evenly covered with water inlet holes 8 in the inverted filter layer 1, and a plurality of drainage pipes 2 are connected vertically and horizontally to form a grid-like drainage network; The pumping well 9 is arranged on one side of the drainage pipe network and corresponds to the water collection well 3 one by one. The pumping well 9 is connected with the water collection well 3 by the drainage pipe 2, and the underground seepage passes through the drainage pipe 2 in the gravel filter layer 1 Converge to the water collecting well 3, and pump out the drainage pipe network by the pumping well 9.

Referring to accompanying drawing 3, described water collection well 3 is arranged at the node that vertically and horizontally connects drainage pipe 2 in gravel filter layer 1, and the cover plate of water collection well 3 is provided with one-way valve 4. The crushed stone filter layer 1 is arranged under the structural bottom plate 11 , an impermeable geotextile 5 is laid on the crushed stone filter layer 1 , and a permeable geotextile 6 is laid under the crushed stone filter layer 1 .

Referring to accompanying drawings 4 to 5, the drainage pipe 2 is a steel pipe uniformly covered with water inlet holes 8, and the drainage pipe 2 is wrapped with a geotechnical filter cloth 7.

The utility model is constructed in this way; excavate to 0.4 ~ 1.0m below the design elevation of the structural bottom plate 11 as the bottom layer, lay a permeable geotextile 6 on the bottom layer, and then lay a gravel pouring filter layer 1 on the permeable geotextile 6 to drain water The pipe 2 is arranged in the gravel filter layer 1 and is connected vertically and horizontally to form a grid-like drainage pipe network. After the gravel filter layer 1 is laid to the design elevation of the structural bottom plate 11, no Permeable geotextile 5. The water collection well 3 is arranged at the nodes of the drainage pipes 2 connected vertically and horizontally on the outside. The pumping wells 9 are arranged on one side of the drainage pipe network and are in one-to-one correspondence with the water collection wells 3 , and the pumping wells 9 are communicated with the water collection wells 3 by the drainage pipe 2 . Underground seepage water flows through the drainage pipe 2 in the gravel filter layer 1 to the water collection well 3 to form a grid-shaped drainage pipe network. When the water in the water collection well 3 exceeds a certain limit, the underground seepage water is pumped out of the drainage pipe network by the pumping well 9 , reduce the buoyancy force of groundwater on the structural bottom plate 11, so that the structural bottom plate 11 not only meets the anti-floating requirements, but also can control the surface settlement of the surrounding environment within the allowable range, greatly reducing the setting of anti-floating piles, especially suitable for 30m deep underground Anti-floating design of space structure.

The above is only a further description of the utility model, and is not intended to limit the patent, and all equivalent implementations of the utility model should be included in the scope of claims of the patent.

Claims (4)

1. reduce pressure under a ultra-deep underground space structure base plate drainage system, it is characterized in that this decompression drainage system is made up of rubble inverted filter, gutter, collecting well and the pumped well be arranged under structure base slab, described gutter is be arranged on the steel pipe that in rubble inverted filter, some are evenly covered with into water aperture, and some gutters are to be connected to form latticed drainage pipeline networks in length and breadth; Described collecting well is arranged on the gutter junction of intersecting in length and breadth outside drainage pipeline networks; Described pumped well be arranged on drainage pipeline networks side and with collecting well one_to_one corresponding, pumped well is communicated with collecting well by gutter, and seepage in underground confluxes to collecting well by the gutter in rubble inverted filter, pumps drainage pipeline networks by pumped well.

2. reduce pressure under ultra-deep underground space structure base plate drainage system according to claim 1, it is characterized in that the cover plate of described collecting well is provided with one way valve.

3. reduce pressure under ultra-deep underground space structure base plate drainage system according to claim 1, it is characterized in that described rubble inverted filter lays waterproof geotextiles, lay permeable geotextiles under rubble inverted filter.

4. reduce pressure under ultra-deep underground space structure base plate drainage system according to claim 1, it is characterized in that described gutter outer wrapping geotechnique anti-filter cloth.